The ranking tweak, which will go into effect this July, "will only affect pages that deliver the slowest experience to users and will only affect a small percentage of queries", Google says in the blog. Interestingly, Google also says that a slow webpage may still rank higher if it has relevant content. Developers have been presented with tools to test their webpages to make sure they don't get penalised in terms of ranking. One example of that is the company's controversial Accelerate Mobile Pages (AMP) project, which places sites with AMP support in front of everyone else on search. It is encouraging developers to think about how performance affects user experience of their page, and to consider user experience metrics.